41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Jeremy Compostella <jeremy.compostella@intel.com>
|
|
Date: Thu, 8 Nov 2018 11:11:00 +0530
|
|
Subject: [PATCH] serial: 8250_dma: stop ongoing RX DMA on exception
|
|
|
|
If we get an exeption interrupt. i.e. UART_IIR_RLSI, stop
|
|
any ongoing RX DMA transfer otherwise it might generate
|
|
more spurious interrupts and make port unavailable anymore.
|
|
|
|
As has been seen on Intel Broxton system:
|
|
...
|
|
[ 168.526281] serial8250: too much work for irq5
|
|
[ 168.535908] serial8250: too much work for irq5
|
|
[ 173.449464] serial8250_interrupt: 4439 callbacks suppressed
|
|
[ 173.455694] serial8250: too much work for irq5
|
|
...
|
|
|
|
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
|
|
---
|
|
drivers/tty/serial/8250/8250_port.c | 3 +--
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
|
|
|
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
|
|
index 60ca19eca1f6..6d2e07fbbba6 100644
|
|
--- a/drivers/tty/serial/8250/8250_port.c
|
|
+++ b/drivers/tty/serial/8250/8250_port.c
|
|
@@ -1845,9 +1845,8 @@ static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir)
|
|
{
|
|
switch (iir & 0x3f) {
|
|
case UART_IIR_RX_TIMEOUT:
|
|
- serial8250_rx_dma_flush(up);
|
|
- /* fall-through */
|
|
case UART_IIR_RLSI:
|
|
+ serial8250_rx_dma_flush(up);
|
|
return true;
|
|
}
|
|
return up->dma->rx_dma(up);
|
|
--
|
|
https://clearlinux.org
|
|
|